Today, the Sound Strike has announced a list of artists who have recently joined the boycott, including Nine Inch Nails, My Morning Jacket, Gogol Bordello, Steve Earle, Chris Rock, Billy Bragg, DJ Spooky, and Throwing Muses.

Meanwhile, opposition to the boycott has been growing. Arizona promoter and activist Charlie Levy has written an open letter to artists asking them not to boycott the state: "By not performing in Arizona, artists are harming the very people and places that foster free speech and the open exchange of ideas that serve to counter the closed-mindedness recently displayed by the new law." The Phoenix New Times has the full text of the letter. The New Times has also released a benefit compilation that features Arizona artists opposed to the immigration law.

Back in April, Stars and Fucked Up frontman Damian Abraham had a Twitter debate on whether or not to boycott the state.

Today, the Sound Strike also posted a video featuring Zack de la Rocha explaining his reasoning for the boycott: